1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * ISA bus.
4  */
5 
6 #ifndef __LINUX_ISA_H
7 #define __LINUX_ISA_H
8 
9 #include <linux/device.h>
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12 
13 struct isa_driver {
14 	int (*match)(struct device *, unsigned int);
15 	int (*probe)(struct device *, unsigned int);
16 	int (*remove)(struct device *, unsigned int);
17 	void (*shutdown)(struct device *, unsigned int);
18 	int (*suspend)(struct device *, unsigned int, pm_message_t);
19 	int (*resume)(struct device *, unsigned int);
20 
21 	struct device_driver driver;
22 	struct device *devices;
23 };
24 
25 #define to_isa_driver(x) container_of((x), struct isa_driver, driver)
26 
27 #ifdef CONFIG_ISA_BUS_API
28 int isa_register_driver(struct isa_driver *, unsigned int);
29 void isa_unregister_driver(struct isa_driver *);
30 #else
isa_register_driver(struct isa_driver * d,unsigned int i)31 static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
32 {
33 	return -ENODEV;
34 }
35 
isa_unregister_driver(struct isa_driver * d)36 static inline void isa_unregister_driver(struct isa_driver *d)
37 {
38 }
39 #endif
40 
41 /**
42  * module_isa_driver() - Helper macro for registering a ISA driver
43  * @__isa_driver: isa_driver struct
44  * @__num_isa_dev: number of devices to register
45  *
46  * Helper macro for ISA drivers which do not do anything special in module
47  * init/exit. This eliminates a lot of boilerplate code. Each module may only
48  * use this macro once, and calling it replaces module_init and module_exit.
49  */
50 #define module_isa_driver(__isa_driver, __num_isa_dev) \
51 static int __init __isa_driver##_init(void) \
52 { \
53 	return isa_register_driver(&(__isa_driver), __num_isa_dev); \
54 } \
55 module_init(__isa_driver##_init); \
56 static void __exit __isa_driver##_exit(void) \
57 { \
58 	isa_unregister_driver(&(__isa_driver)); \
59 } \
60 module_exit(__isa_driver##_exit);
61 
62 /**
63  * max_num_isa_dev() - Maximum possible number registered of an ISA device
64  * @__ida_dev_ext: ISA device address extent
65  *
66  * The highest base address possible for an ISA device is 0x3FF; this results in
67  * 1024 possible base addresses. Dividing the number of possible base addresses
68  * by the address extent taken by each device results in the maximum number of
69  * devices on a system.
70  */
71 #define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)
72 
73 #endif /* __LINUX_ISA_H */
74